CALIBRATION PROCEDURE I -TFC/MAN. MODE
Connect chlorine sensor to input terminal as in Fig. 3. Install shorting plug on BNC connector.
§ turn the analyzer on and prepare it for use in accordance with preliminary instructions.
Place the sensor and solution ground (connected to No. 14, Fig. 2) into a beaker with about 600 to
800 ml of chlorine demand free water on a magnetic stirrer. Do not run the stirrer so fast as to create
air bubbles in the solution. Add 1 ml. of a pH 4 or 5 buffer. Allow the sensor to stabilize for about 1
Set function switch to TFC/MAN, display switch to pH and range switch to 1.
LCD display will flash on and off with switches in this configuration. Adjust the pH set control on the
front panel until the display reads the value to which test solution pH was corrected to.
Set display switch to CL.
Adjust the CL ZERO TRIMPOT until the display reads 0.00.
Now add a dilute hyprochlorite solution drop wise until a reading of between 25 to 50% of range is
obtained. Allow the solution to stabilize for about 2 to 3 minutes. (Note: to prepare dilute hyprochlorite
solution, add 10 cc of 5% bleach, such as Clorox to 100 cc of water).
Withdraw sample of solution and check for concentration of chlorine using DPD-50 test kit or other test
Adjust the CL SPAN TRIMPOT (R820) to the value obtained with the test kit or other test method used.
The analyzer is now calibrated and the sensor may be placed in the sample stream.
CALIBRATION PROCEDURE I -TFC/AUTO MODE
Connect the chlorine sensor and pH sensor to the input terminals as in Fig. 3.
Turn on the analyzer and prepare it for use in accordance with preliminary instructions.
Set function switch to TFC/AUTO, display switch to pH.
Place the pH sensor and solution ground in a beaker of pH 7 buffer solution and stir for a minute or two.
Allow the reading to stabilize. Using the pH zero trimpot (R851) adjust until LCD display read 7.00.